Amanatsu+

A city kid transplants to the countryside for the summer and falls for a local girl, which is a simple enough setup until the Nanakayama school festival turns his sleepy new life upside down.

Between the maid cafes, a classmate's insistence he join a class haunted-house act, and a girlfriend angling to get him onto the festival executive committee just so they can share more time together, he spends most of the story reacting to chaos he didn't sign up for. He's not used to school events, but he wades in anyway, mostly because she's there. Even after summer break ends, the two of them keep going, first visits to her room, a date at the shopping mall, the ordinary stuff that feels enormous when you're young.

There's not much to manage here beyond following the relationship as it unfolds through the festival prep and the days after. It reads like a romance first and a game second, low on friction, heavy on the small domestic moments between two people who like each other.